4 Answers

Voltage to the blower motor comes from the ignition switch. At the blower motor connector, with hvac on, did you check for voltage and ground? If so, what were you missing, voltage or ground?
The resistors and speed control are part of the ground circuit.
Check the ignition switch connector, see if anything melted, key on.

To make sure I understand, you had voltage at the blower motor connector, key on?
To check ground use a testlight connected to voltage, touch the ground terminal, if the light comes on, the ground is good, at least good enough to turn on the lamp. With blower motor control on.

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